US | NEW YORK
UPDATE: NEW YORK
Much is getting underway underground, once again, in New York city and state. T&TNA casts a spotlight to update on a few projects
Numerous investments have been made to use underground space for public infrastructure in New York city and state, and more projects are underway. This snapshot gives a brief view upon a few such
current investments – in transport and public health and environmental improvement infrastructure. On transport, below is a marker update on the twin-
tube Hudson Tunnel Project to provide a new rail link between Manhattan, in New York city, and New Jersey on the other side of the Hudson River. Much preparatory work is needed. There is also refurbishment of an existing rail tunnel as part of the huge project. Also on transport, and on preparatory works too –
and still in Manhattan, but to the northeast – is a further rail transport investment but this time on the sub-sector of subway networks. The early works for the next stage of Second Avenue Subway are underway (see box panel-1). This snapshot gives a brief view upon a few such
current investments – in transport and public health and environmental improvement infrastructure. We look at Hudson Tunnel Project to provide a new rail link between Manhattan and New Jersey; early works for the next stage of Second Avenue Subway, also in Manhattan (see box panel-1); and, outside the city, a treated wastewater conveyance tunnel on Long Island (see box panel-2).
FIRST HEAVY CIVILS CONTRACT FOR HUDSON TUNNEL The Gateway Development Commission (GDC) has awarded the Hudson River Ground Stabilization (HRGS) Project to Weeks Marine, marking the first heavy construction contract for the Hudson Tunnel Project (HTP). The US$284m HRGS Project will modify conditions
in the Hudson River to allow the tunnel to be excavated by tunnel boring machine (TBM). In the low-cover area of the Hudson River off Manhattan’s shoreline, the riverbed comprises silt too soft to support a tunnel. By injecting grout into the silt, columns of soil mixed with cement and water will stabilize the ground above the future tunnel. Temporary sheet pile cofferdams will enclose the work zone, enabling in-water ground improvement to be completed one phase at a time, beginning in the section of the river closest to Manhattan and moving westward toward the Hudson River’s navigation channel. Weeks Marine will begin work this year. Phase One
of the project, to be undertaken from Spring to Fall, includes surveying and also the design and construction of a test cofferdam. Phase Two, from Fall to Spring 2027, includes the design and construction of the remaining works related to the HRGS Project. The GDC said that, in authorizing the Hudson Tunnel’s
first heavy construction work, “we are one step closer to crossing the Rubicon and securing this tunnel’s future. Work is on-track and there can be no turning back on the 21st century transportation experience our riders have long been waiting for.” The US$16bn Gateway Program involves building a
new 2.4-mile two-tube tunnel under the Hudson River, between Newark, New Jersey, and New York City’s Penn Station, and refurbishing Amtrak’s existing 112-year-old North River rail tunnel, which was badly damaged by Hurricane Sandy in 2012. In November last year, ground was broken on
both sides of the Hudson River, with construction under way on the Hudson Yards Concrete Casing: Section 3, on Manhattan’s west side, and on the Tonnelle Avenue Bridge and Utility Relocation Project, in New Jersey. The Hudson Yards Concrete Casing: Section 3 project
is preserving an essential right-of-way to guarantee the new tunnel’s connection to New York Penn Station. Five out of the nine packages for the Hudson Tunnel
Above: Layout map of the Hudson Tunnel Project PHOTO CREDIT: GATEWAY DEVELOPMENT COMMISSION
14 | Spring 2024
Project are either in procurement, awarded, or under construction.
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